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regExp.multiline

The multiline property indicates whether or not the "m" flag is used with the regular expression. multiline is a read-only property of an individual regular expression instance.

Property attributes of RegExp.prototype.multiline
Writable no
Enumerable no
Configurable yes

Description

The value of multiline is a Boolean and is true if the "m" flag was used; otherwise, false. The "m" flag indicates that a multiline input string should be treated as multiple lines. For example, if "m" is used, "^" and "$" change from matching at only the start or end of the entire string to the start or end of any line within the string.

You cannot change this property directly.

Examples

Using multiline

var regex = new RegExp('foo', 'm');

console.log(regex.multiline); // true

Specifications

Specification Status Comment
ECMAScript 3rd Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.2. JavaScript 1.5: multiline is a property of a RegExp instance, not the RegExp object.
ECMAScript 5.1 (ECMA-262)
The definition of 'RegExp.prototype.multiline' in that specification.
Standard
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'RegExp.prototype.multiline' in that specification.
Standard multiline is now a prototype accessor property rather than an instance's own data property.
ECMAScript Latest Draft (ECMA-262)
The definition of 'RegExp.prototype.multiline' in that specification.
Draft

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes Yes Yes Yes Yes Yes
Prototype accessor property (ES2015) Yes ? 38 ? Yes Yes
Feature Android webview Chrome for Android Edge mobile Firefox for Android Opera Android iOS Safari Samsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?
Prototype accessor property (ES2015) Yes Yes ? 38 Yes Yes ?

Compatibility notes

  • Prior to Firefox 48, a non-standard, global RegExp.multiline property existed in addition to this RegExp.prototype.multiline property. It is removed in newer versions (see bug 1219757). Use the property described on this page or the m flag instead.

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/multiline